Yes, but importantly, generating them with the AI trained on Mickey is not.
Is selling colored pencils that can draw images of Mickey a copyright violation?
The way I see it, the tool can't ever be at fault for its use, unless its sole use (or something close enough to its sole use) is to infringe in copyright.
Besides, the safeguarding of copyright isn't the single variable we as a society should be solving for. General global productivity is way more valuable than guaranteeing Disney's bottom line.
Even then, you could look at a tape recorder or a photocopier and one of their primary uses is to make a copy of a copyrighted work.
The question isn't "can it be used for" but rather "does it have valid non-infringing use" and "when it does infringe, is it the person who uses the tool or the tool that is at fault?"
That is certainly not clear, unless its only purpose was to do that.
I don't think that courts have ruled on that specifically (yet), but I seriously doubt that it would be. Taking the image of Mickey and distributing it would certainly be, though.
A photocopier can generate images of Mickey. Does that make a photocopier illegal?
That stance is clearly not supported by copyright law.
If, however, we're talking about copyright violations applying to the distribution of works generated by AI, that's an entirely different conversation. It's still not really clear-cut, but there are ways that could be in violation of copyright law.
It isn't the case that AI is being treated differently, though. The issues would be the same if a human were doing all of this stuff.